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  1. Replies
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    https://www.mouser.com/Connectors/D-Sub-Connectors...

    https://www.mouser.com/Connectors/D-Sub-Connectors/_/N-9gxxm?P=1ytcy2g...
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    Looking at Digikey and Mouser, the 19 pin D-sub...

    Looking at Digikey and Mouser, the 19 pin D-sub connectors are still made, but you probably won't like the prices for any of the ones with shorter lead time availability. Some are marked as ship from...
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    I expect it is relying on the Z80 to run the DRAM...

    I expect it is relying on the Z80 to run the DRAM refresh cycles. That is hinted at in the restriction of the longest DMA burst latency in the specifications section.
  4. Thread: Atex PDP-11/34

    by cruff
    Replies
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    2,238

    You need to concentrate on identifying which...

    You need to concentrate on identifying which serial port is the ODT console port that the J-11 CPU will talk to if it is configured to enter ODT at reset. This port is also commonly used by the DEC...
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    I ran it from a telnet session on 7.3 and it...

    I ran it from a telnet session on 7.3 and it wrote its output to my telnet session without problem.
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    Here are the numbers for a VAXstation 4000/60...

    Here are the numbers for a VAXstation 4000/60 running OpenVMS 7.3:

    0000.0300
    0001.1700
    0008.7002
  7. Thread: Atex PDP-11/34

    by cruff
    Replies
    28
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    2,238

    Did you measure across the -15 V and +15 V lines?...

    Did you measure across the -15 V and +15 V lines? If so, then 30 V would be correct since there would be a 30 V potential across both. You need to measure each one individually against ground to...
  8. Thread: Atex PDP-11/34

    by cruff
    Replies
    28
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    2,238

    If you have an oscilloscope, that would give you...

    If you have an oscilloscope, that would give you a lot of flexibility in problem solving. If not, can you get ahold of some type of RS-232 breakout box with LED indicators, or something like I bought...
  9. Thread: Atex PDP-11/34

    by cruff
    Replies
    28
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    2,238

    Was everything cabled up when you got the system?...

    Was everything cabled up when you got the system? If so, you did record where every cable went? Is there a DLART on the CPU board? That will almost certainly be the console port.
  10. Thread: Atex PDP-11/34

    by cruff
    Replies
    28
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    2,238

    The panel board marked Workstation III/LAN...

    The panel board marked Workstation III/LAN mentions Thinnet and AUI, which are commonly used to describe Ethernet cable variants. If you get an AUI to Twisted Pair adapter (i.e. RJ45 connectors),...
  11. Thread: Atex PDP-11/34

    by cruff
    Replies
    28
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    2,238

    Since the CPU board has a J-11 on it, it will...

    Since the CPU board has a J-11 on it, it will have built in ODT, which if you can figure out how to configure the board to set the power up mode bits (in the configuration regsiter) appropriately,...
  12. I am now pursuing this for the HP 98x5 series of...

    I am now pursuing this for the HP 98x5 series of computers after I was not able to get my 98035A clock interface to an operational state after the battery had leaked on it years before I got it. The...
  13. You can scavenge key parts from some of the old...

    You can scavenge key parts from some of the old TI-99/4 home computers, and possibly other keyboards from that time frame. The key caps can be removed by pulling them straight out. The thin walled...
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    At the National Center for Atmospheric Research...

    At the National Center for Atmospheric Research (NCAR), we used HiPPI for the high speed Mainframe and Server Network (MASnet) network between the supercomputers, front end server and the Mass...
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    SGI systems had a port of Doom for them, we used...

    SGI systems had a port of Doom for them, we used to play on our Indigos and Indys. That was great fun. Once during a death match I managed to kill another player's character at a respawn location,...
  16. It seems that it is nearly impossible to find any...

    It seems that it is nearly impossible to find any sort of errata for Zilog chips. I tried for quite a while to find Z180 errata, and failed, but just had to assume that some behavior that another...
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    Find that ASCII Star Wars movie?

    Find that ASCII Star Wars movie?
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    You appear to have bought something that is in a...

    You appear to have bought something that is in a 11/34 chassis but is not in fact an 11/34. Atex built systems to support publishing and typesetting, and it may be hard to find much information...
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    Yay! Now you can get down to really testing it...

    Yay! Now you can get down to really testing it out.



    You've already placed disks into the drives, so why not try one of those and not write or modify the disk until you can get them copied?
    ...
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    Maybe the one marked VDI Keyboard instead in case...

    Maybe the one marked VDI Keyboard instead in case the keyboard is a parallel scanned keyboard that might be harmed by RS-232 voltage levels?
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    The latched A0 will be the byte select signal for...

    The latched A0 will be the byte select signal for the byte sized write operation.
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    Does it require an external cable to make the...

    Does it require an external cable to make the connection between the connector marked "Serial Terminal" to the "VDI Serial Port" to function?
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    Words and byte accesses share the same address...

    Words and byte accesses share the same address space. For the J11, all reads are full word reads (i.e. an even address will be presented), and the CPU selects the needed byte internally (section 3.5...
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    Does it actually have the serial I/O controller...

    Does it actually have the serial I/O controller board? It looks like two of the DB-25 connectors might be wired for RS-232 serial. If you attach something to them, is anything output on the serial...
  25. Thread: Sick SBC6120

    by cruff
    Replies
    8
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    598

    Have you checked for bad solder joints?

    Have you checked for bad solder joints?
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